Search found 56 matches

by aurgathor
Tue May 07, 2019 3:31 pm
Forum: Antennas
Topic: proper antenna for energy meter monitoring (900Mhz)
Replies: 5
Views: 583

Re: proper antenna for energy meter monitoring (900Mhz)

You should be able to figure out if the transmitter is on or not. You can just use a piece of wire as an antenna and have them near the meter, and look at the spectrum. If there is a very strong signal around 900 MHz, that is probably your meter. Then move away from the meter to see if the signal le...
by aurgathor
Fri May 03, 2019 3:22 pm
Forum: Antennas
Topic: proper antenna for energy meter monitoring (900Mhz)
Replies: 5
Views: 583

Re: proper antenna for energy meter monitoring (900Mhz)

Why a dipole antenna? Methinks a quarter wave monopole should work just fine, too.
by aurgathor
Thu May 02, 2019 4:06 pm
Forum: Other SDR Devices
Topic: SDR Upgrade
Replies: 5
Views: 760

Re: SDR Upgrade

Yeah, I'd second the suggestion for a bandpass filter, either a switchable filter, or standalone filters for the desired band(s) based on the issues listed.
by aurgathor
Tue Apr 23, 2019 12:37 am
Forum: Other SDR Devices
Topic: Ham It Up + Cubic SDR problem
Replies: 1
Views: 266

Re: Ham It Up + Cubic SDR problem

Unless you do some input filtering, you'll get both up and down converted products.

Use a low pass filter (say, 100 Mhz) between the antenna and the ham-it-up.
by aurgathor
Thu Apr 18, 2019 5:38 pm
Forum: RTL-SDR Discussion
Topic: rtl-sdr .usb problem
Replies: 1
Views: 206

Re: rtl-sdr .usb problem

Re-run zadig
by aurgathor
Wed Apr 17, 2019 2:57 pm
Forum: Off-Topic
Topic: USB cable
Replies: 3
Views: 741

Re: USB cable

Any size of extender cable should work as long as it can handle the roughly 300 mA without a significant voltage drop and it's not too bad otherwise. I bought some 6" pigtail extender cables for the exact same reason from monoprice 5+ years ago and they work fine with RTL-SDR dongles. (monoprice no ...
by aurgathor
Sun Apr 14, 2019 1:19 am
Forum: Other SDR Devices
Topic: Why Tx/Rx devices are so expansives ?
Replies: 9
Views: 18255

Re: Why Tx/Rx devices are so expensive?

RichardsonRFPD will conduct several one day seminars in the US for mere $150, and that price will include a Pluto SDR learning module. If someone can attend one without paying for hotel and airfare, I think the complete package is a steal at that price. The Pluto itself is over $140 from Mouser. Key...
by aurgathor
Mon Feb 25, 2019 4:30 am
Forum: Antennas
Topic: broken antenna
Replies: 1
Views: 471

broken antenna

The top of the included "23cm to 1m telescopic antenna" broke off after the second section-- is there an exact replacement available somewhere? (part number or link) Looking at eBay, comparable antennas are available from around $1.50 apiece, but the 1 m long antennas utilize 7 section vs. 5 for the...
by aurgathor
Wed Feb 20, 2019 8:18 pm
Forum: Other SDR Devices
Topic: Check out the specs on THESE receivers!
Replies: 2
Views: 4553

Re: Check out the specs on THESE receivers!

That could be the MSRP, and one could probably get one for a mere $50k or so nowadays.... :roll:

At my previous work place they've got a couple of R&S signal and spectrum analyzers, but I only got to use the ancient HP spectrum analyzers.
by aurgathor
Wed Feb 20, 2019 8:07 pm
Forum: Other SDR Devices
Topic: Hackrf one - increase RX-TX
Replies: 7
Views: 14871

Re: Hackrf one - increase RX-TX

LOL. ;) You can most certainly argue that an amplifier is an amplifier and you can use an LNA in both places, but what you normally want to use for TX is an RF power amplifier. https://en.wikipedia.org/wiki/RF_power_amplifier While *in theory* one can certainly make an amplifier that could work in b...